2002021021 has 32 divisors (see below), whose sum is σ = 2753646336. Its totient is φ = 1404864000.

The previous prime is 2002021019. The next prime is 2002021027. The reversal of 2002021021 is 1201202002.

It is a cyclic number.

It is not a de Polignac number, because 2002021021 - 2¹ = 2002021019 is a prime.

2002021021 is a modest number, since divided by 21021 gives 2002 as remainder.

It is a junction number, because it is equal to n+sod(n) for n = 2002020989 and 2002021007.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2002021027) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 16651 + ... + 65431.

It is an arithmetic number, because the mean of its divisors is an integer number (86051448).

Almost surely, 2^2002021021 is an apocalyptic number.

It is an amenable number.

2002021021 is a deficient number, since it is larger than the sum of its proper divisors (751625315).

2002021021 is a wasteful number, since it uses less digits than its factorization.

2002021021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 48853.

The product of its (nonzero) digits is 16, while the sum is 10.

The square root of 2002021021 is about 44743.9495462794. The cubic root of 2002021021 is about 1260.3452948423.

Adding to 2002021021 its reverse (1201202002), we get a palindrome (3203223023).

It can be divided in two parts, 20020 and 21021, that added together give a triangular number (41041 = T₂₈₆).

The spelling of 2002021021 in words is "two billion, two million, twenty-one thousand, twenty-one".